[LUCENE-2627] MMapDirectory chunking is buggy

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.4, 3.0.3, 3.1, 4.0-ALPHA
• Component/s: core/store
• Lucene Fields: New
• Assignee: Robert Muir
• Reporter: Robert Muir
• Created: 27/Aug/10 18:03
• Updated: 28/Aug/22 12:31
• Resolved: 27/Aug/10 22:54

Description

MMapDirectory uses chunking with MultiMMapIndexInput.

Because Java's ByteBuffer uses an int to address the
values, it's necessary to access a file >
Integer.MAX_VALUE in size using multiple byte buffers.

But i noticed from the clover report the entire MultiMMapIndexInput class is completely untested: no surprise since all tests make tiny indexes.